CN218862755U - Steel two-conical-surface PCr piston ring - Google Patents

Abstract

The utility model relates to a piston ring technical field specifically is a two conical surface PCr piston rings of steel, including the piston ring base member, the excircle cross sectional shape of piston ring base member is the toper, and the outer disc of piston ring base member is provided with the PCr layer, the utility model discloses an at the excircle surface coating PCr layer of piston ring base member, because the low wear resistance on PCr layer, can reduce the coefficient of friction on piston ring base member surface, reduce the friction loss to the PCr layer possesses high hardness, can reach 1200 +/-300 HV, and the wearability is good, can improve the life of piston ring, and the raw and other materials price on PCr layer is cheap simultaneously, convenient for material collection.

Description

Steel secondary conical surface PCr piston ring

Technical Field

The utility model relates to a piston ring production technical field specifically is a two conical surface PCR piston rings of steel.

Background

The second scraping ring needs to form an oil scraping conical surface, the conical surface is generally ground by a forming grinder, a large machining allowance needs to be reserved, and the number of auxiliary procedures is large; because the contact point between the conical surface and the cylinder sleeve is small, the abrasion is fast, the excircle generally needs to be subjected to chromium plating treatment, the environment is not protected, and the cost is high. Along with the requirements on the discharge capacity, the service life and the like of the engine are higher, the requirements on the friction coefficient and the wear resistance of the conical surface are higher;

the traditional two-cone piston ring is generally made of spheroidal cast iron or a steel ring, is made of rectangular materials, can form a taper angle for scraping oil only by molding and grinding, generally has the machining allowance of 0.03-0.05mm, low material utilization rate, high energy consumption, more auxiliary processes, needs a chromium plating coating with the diameter of 0.04mm on the excircle to prolong the service life, has poor environmental protection property of a chromium plating process, generates excessive heavy metal waste, and has high energy consumption, low efficiency and long period; the chrome-plated ring has poor wear resistance and high friction coefficient. Because of the need of forming and grinding, the chromium plating angle of the excircle is easy to be damaged, and the edge breakage waste products after chromium plating are easy to be caused.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a two conical surface PCR piston rings of steel in order to solve the problem that the above-mentioned background art mentioned.

In order to achieve the above object, the utility model provides a following technical scheme: the steel secondary conical surface PCr piston ring comprises a piston ring base body, wherein the section of an outer circle of the piston ring base body is conical, and a PCr layer is arranged on the outer circle surface of the piston ring base body.

Preferably, the upper and lower surfaces of the piston ring base are uniformly coated with a phosphate coating.

Preferably, the thickness of the PCr layer is 5 to 30 μm.

Preferably, the surface roughness of the PCr layer 2 is not more than Rz1.6.

Preferably, the taper angle of the trapezoidal surface of the piston ring base is alpha, and the range of alpha is 2 degrees 30'± 10'.

Preferably, the piston ring base is formed by round wire rolling.

Preferably, a thin chromium layer is arranged between the PCR layer and the outer circular surface of the piston ring base body.

Preferably, the thickness of the thin chromium layer is 1 to 2 μm.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses an at the excircle surface coating PCR layer of piston ring base member, because the low wear resistance on PCR layer can reduce the coefficient of friction on piston ring base member surface, reduce the friction loss to the PCR layer possesses high hardness, can reach 1200 HV 300HV, and the wearability is good, can improve the life of piston ring, and the raw and other materials on PCR layer are cheap simultaneously, convenient for material collection.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the description below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic top view of a piston ring substrate according to the present invention;

FIG. 2 is a first structural schematic view of a piston ring base according to the present invention, partially seen from the side;

fig. 3 is a second schematic view of the piston ring base according to the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1. a piston ring substrate; 2. a PCR layer; 3. a phosphate coating; 4. a thin chromium layer.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.

Referring to fig. 1-3, the present invention provides a technical solution:

a steel secondary conical surface PCr piston ring comprises a piston ring base body 1, wherein the section of an outer circle of the piston ring base body 1 is conical, and a PCr layer 2 is arranged on the outer circle surface of the piston ring base body 1.

Specifically, the upper surface and the lower surface of the piston ring base body 1 are uniformly coated with the phosphate coating 3.

From the above description it follows that: the phosphate coating formed by the phosphate treatment on the upper and lower sides can improve the wear resistance and lubricity of the piston ring, thereby prolonging the service life of the piston ring.

Specifically, the thickness of the PCr layer 2 is 5 to 30 μm.

From the above description it follows that: the thickness of the PCR layer is taken from the range, so that the wear resistance of the PCR layer can be ensured, and the problems of overlarge stress, large brittleness and easy falling of the film layer can be avoided.

Specifically, the surface roughness of the PCr layer 2 is not more than rz1.6.

Specifically, the taper angle of the trapezoidal surface of the piston ring base 1 is α, and α is in the range of 2 ° 30'± 10'.

Specifically, the piston ring base 1 is formed by round wire rolling.

From the above description it follows that: the piston ring matrix formed by rolling the round wire does not need to reserve machining allowance, the production yield can be improved, and the production machining period is shortened.

Specifically, a thin chromium layer 4 is arranged between the PCR layer 2 and the outer circular surface of the piston ring base body 1.

From the above description it follows that: the hardness gradient between the PCr layer and the piston ring substrate can be formed relatively gently, the bonding strength between the film layers is improved, and the service life of the piston ring is prolonged.

Specifically, the thickness of the thin chromium layer 4 is 1 to 2 μm.

From the above description it follows that: the thickness of the thin chromium layer is taken from the range, so that the bonding strength of the matrix and the PCr layer can be prevented from being influenced, and the wear resistance of the film layer can be improved.

Referring to fig. 1-2, a first embodiment of the present application is:

the piston ring is processed according to the following steps:

1. rolling round wires, adjusting corresponding rolling equipment and rolling equipment according to the cross section of the wire rod, and then producing the wire rod with the cone angle of 2 degrees of 30 '+/-10' at one time in a rolling and rolling mode;

2. the piston ring with certain elasticity and ovality of minus 0.10 +/-0.30 is processed by normal circle winding and forming and heat setting after opening;

3. finishing the mouth: the closed clearance of the piston ring reaches the design value;

4. pre-bright band: carrying out sand blasting pre-polishing treatment on the surface and the outer circular surface of the piston ring through 4000# green silicon carbide sand blasting to form a piston ring substrate 1;

5. outer circle plating PVD treatment: the treatment time is 7 to 8 hours, and the treatment temperature is 300 to 400 ℃, so that a chromium coating 4 is obtained;

6. then loading the mixture into a PCr furnace, carrying out vacuum coating treatment by a vacuum multi-arc ion plating gas deposition method (CrN) and adopting chromium nitride as a coating material, wherein the treatment process time is as follows: 3-3.5 hours; treatment temperature: 150-250 degrees and the coating thickness is 0.008 +/-0.003 mm, a PCr layer 2 is formed on the outer circumferential surface of the piston ring substrate 1, and the forming principle of the PCr layer 2 is as follows: firstly, after a vacuum chamber is vacuumized, a workpiece is preheated, the surface to be plated is bombarded and cleaned, an electric arc is ignited through an electric arc device in high vacuum, an electromagnetic coil is adopted to adjust the intensity of magnetic field, improve electric arc discharge, finely crush the electric arc, accelerate the rotating speed, thin film layer particles, generate acceleration effect on the charged particles, and form a PCr coating with high hardness, low friction coefficient, high elastic modulus, high tensile cylinder resistance and good film-substrate binding force on the outer circular surface of a doctor blade ring;

7. processing a bright band: processing a bright band by a diamond grinding material of 1um after film coating;

8. finely grinding the end face;

9. phosphating, wherein the treatment process time is 3-5 minutes, and the treatment temperature is as follows: forming the phosphating layers 3 on the upper surface and the lower surface at 80-90 degrees to obtain the steel secondary conical surface PCR piston ring.

In the description of the present invention, it is to be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "one side", "top", "inner", "front", "center", "both ends", and the like, indicate orientations or positional relationships based on the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the present invention, unless otherwise explicitly specified or limited, the terms "mounted", "disposed", "connected", "fixed", "screwed" and the like are to be understood broadly, and may be, for example, a fixed connection, a detachable connection, or an integral body; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate medium, and may be connected through the inside of two elements or in an interaction relationship between two elements, unless otherwise specifically defined, and the specific meaning of the above terms in the present invention will be understood by those skilled in the art according to specific situations.

Although embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.

Claims (8)

1. A steel two conical surface PCR piston ring is characterized in that: the piston ring is characterized by comprising a piston ring base body (1), wherein the section of the outer circle of the piston ring base body (1) is conical, and a PCR layer (2) is arranged on the outer circular surface of the piston ring base body (1).

2. The steel secondary cone PCr piston ring as claimed in claim 1, wherein: the upper surface and the lower surface of the piston ring base body (1) are uniformly coated with the phosphate coating (3).

3. A steel double-cone PCr piston ring as claimed in claim 1, wherein: the thickness of the PCR layer (2) is 5-30 mu m.

4. The steel secondary cone PCr piston ring as claimed in claim 1, wherein: the surface roughness of the PCr layer (2) is less than or equal to Rz1.6.

5. The steel secondary cone PCr piston ring as claimed in claim 1, wherein: the conical surface angle of the trapezoidal surface of the piston ring base body (1) is alpha, and the range of the alpha is 2 degrees, 30 '+/-10'.

6. The steel secondary cone PCr piston ring as claimed in claim 1, wherein: the piston ring base body (1) is formed by rolling round wires.

7. The steel secondary cone PCr piston ring as claimed in claim 1, wherein: and a chromium thin layer (4) is arranged between the PCR layer (2) and the outer circular surface of the piston ring base body (1).

8. The PCr piston ring as claimed in claim 7, wherein: the thickness of Bao Geceng (4) is 1-2 μm.

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